in filter.go [137:145]
func (a ArgumentConditions) Validate() []string {
var problems []string
for _, condition := range a {
if condition.Argument < 0 || condition.Argument > 5 {
problems = append(problems, fmt.Sprintf("argument must be between 0 and 5 (inclusive), but is %v", condition.Argument))
}
}
return problems
}